Will history remember Rio as the swansong gathering of the US-led world order as we now know it? The curtain is coming down on Joe Biden's last G20 summit – his last big global gathering before the return of Donald Trump to the White House. The outgoing US president, who turns 82 on Wednesday, is slightly older than the United Nations, the World Bank and the International Monetary Fund; all institutions that evolved on Washington’s watch. The neoliberal rules of the global game are often referred to as the Washington consensus.